Base station emulator

• US 5,495,508 A
• Filed: 12/01/1994
• Issued: 02/27/1996
• Est. Priority Date: 11/20/1987
• Status: Expired due to Term

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Kurtz, Scott D., Kaewell, John D. Jr.
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Socure, Tesfaldet
• Application Number:
  US08/347,835
• Time in Patent Office: 453 Days
• Field of Search: 375/356, 375/219, 375/211, 375/220, 370/103, 370/105.1, 370/95.1, 370/95.3, 370/24, 370/29, 370/26, 370/104.1, 455/34.1, 455/49.1, 455/54.1, 455/34.1, 455/34.2, 455/53.1, 455/51.1, 381/2
• US Class Current: 375/356
• CPC Class Codes: H04B 7/2678 Time synchronisation
• CPC Class Codes: H04B 7/2681 Synchronisation of a mobile station with one base station
• CPC Class Codes: H04J 3/0685 Clock or time synchronisation in a node; Intranode synchronisation
• CPC Class Codes: H04M 1/725 Cordless telephones user interfaces specially adapted therefor H04M1/724
• CPC Class Codes: H04M 1/72505 Radio link set-up procedures
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A wireless digital telephone system containing at least one emulated base station plus one or more subscriber stations, the emulated base station comprising a station similar to the subscriber station but having the capability of initiating a synchronization process whereby it is enabled to assign time slots to the subscriber station within the frame pattern of an amplitude signal by means of monitoring for positive edges in the signal.

Claims

1. A telecommunication system for conducting a plurality of telephonic communications which comprise transmitted (TX) and received (RX) speech information using wireless transmissions between a primary station and one or more secondary stations over one of a plurality of available frequencies, the system comprising:

the primary station having;

(i) means for transmitting synchronization information including the assignment of time slots, each time having the same fixed duration, on a selected frequency;

(ii) means for transceiving said plurality of telephonic communications on the selected frequency including;

(a) means for transmitting in a first fixed time slot a signal carrying said TX speech information of a first telephonic communication on the selected frequency;

(b) means for transmitting in a second fixed time slot a signal carrying said TX speech information of a second telephonic communication on the selected frequency;

(c) means for receiving in a third fixed time slot a signal carrying said RX speech information of said first telephonic communication transmitted from a secondary station on the selected frequency;

(d) means for receiving in a fourth fixed time slot a signal carrying said RX speech information of said second telephonic communication transmitted from a secondary station on the selected frequency;

a first secondary station having;

(i) means for receiving the synchronization information from the primary station and for identifying the assignment of fixed time slots for reception of said signal carrying TX speech information and transmission of said signal carrying corresponding RX speech information of said first telephonic communication;

(ii) means for receiving said signal carrying TX speech information of said first telephonic communication on said first fixed time slot of the selected frequency; and

(iii) means for transmitting said signal carrying corresponding RX speech information of said first telephonic communication on a third fixed time slot of the selected frequency; and

a second secondary station having;

(i) means for receiving the synchronization information from the primary station and for identifying the assignment of fixed time slots for reception of said signal carrying TX speech information and transmission of said signal carrying corresponding RX speech information of said second duplex telephonic communication;

(ii) means for receiving said signal carrying TX speech information of said second telephonic communication on said second fixed time slot of the selected frequency; and

(iii) means for transmitting said signal carrying corresponding RX speech information of said second duplex telephonic communication on a fourth fixed time slot of the selected frequency.

2. A telecommunication system according to claim 1 wherein:

(a) at least one of said secondary stations is a dual station which includes;

(i) means for receiving the synchronization information from said primary station and for identifying the assignment of time slots on said selected frequency for signals carrying speech information of said plurality of telephonic communications;

(ii) means for receiving a plurality of said signals carrying TX speech information of said plurality of telephonic communications on said selected frequency in a first plurality of said assigned time slots; and

(iii) means for transmitting a plurality of said signals carrying corresponding RX speech information of said plurality of telephonic communications on the selected frequency in a second plurality of said assigned time slots; and

(b) said dual station serves as both said first secondary station and said second secondary station.

3. A telecommunication system according to claim 1 wherein the primary station is one of a plurality of subscriber units which telecommunicate with a base station and wherein at least one of said secondary stations is positioned outside the operating range of said base station at a remote location whereat direct communication with said base station can not be made.

4. A telecommunication system for conducting a plurality of communications which comprise transmitted (TX) and received (RX) information using wireless transmissions between a primary station and one or more secondary stations over one of a plurality of available frequencies, the system comprising:

the primary station having;

(i) means for transmitting synchronization information including the assignment of fixed periodic time slots on a selected frequency, at least two sequential fixed periodic transmit time slots for transmission from said primary station and at least two sequential fixed periodic reception time slots for reception by said primary station, said fixed time slots having the same duration;

(ii) means for transmitting a signal carrying the TX information of a first communication on the selected frequency in a first assigned transmit slot;

(iii) means for transmitting a signal carrying the TX information of a second communication on the selected frequency in a second assigned, transmit slot;

(iv) means for receiving a signal carrying the RX information of said first communication transmitted from a secondary station on the selected frequency in a first assigned reception slot;

(v) means for receiving a signal carrying the RX information of said second communication transmitted from a secondary station on the selected frequency in a second assigned reception slot;

a first secondary station having;

(i) means for receiving the synchronization information from the primary station and for identifying the assignment of time slots for reception of said signal carrying TX speech information and transmission of said signal carrying corresponding RX speech information of said first duplex communication with said primary station;

(ii) means for receiving said signal carrying TX information of said first communication on the selected frequency in said first assigned transmit slot; and

(iii) means for transmitting said signal carrying corresponding RX information of said first communication on the selected frequency in said first assigned reception slot; and

a second secondary station having;

(i) means for receiving the synchronization information from the primary station and for identifying the assignment of time slots for reception of said signal carrying TX speech information and transmission of said signal carrying corresponding RX speech information of said second duplex communication with said primary station;

(ii) means for receiving said signal carrying TX information of said second duplex communication on the selected frequency in said second assigned transmit slot; and

(iii) means for transmitting said signal carrying corresponding RX information of said second duplex communication on the selected frequency in said second assigned reception slot.

5. A telecommunication system according to claim 4 wherein:

(a) at least one of said secondary stations is a dual station which includes;

(i) means for receiving the synchronization information from said primary station and for identifying the assignment of time slots on said selected frequency for signals carrying TX and RX information of said plurality of communications;

(ii) means for receiving a plurality of said signals carrying TX information of said plurality of telephonic communications on the selected frequency in a first plurality of said assigned transmit slots; and

(iii) means for transmitting a plurality of said signals carrying corresponding RX information of said plurality of telephonic communications on the selected frequency in a second plurality of said assigned reception slots; and

(b) said dual station serves as both said first secondary station and said second secondary station.

6. A telecommunication system according to claim 4 wherein the primary station is one of a plurality of subscriber units which telecommunicate with a base station and wherein at least one of said secondary stations is positioned outside the operating range of said base station at a remote location whereat direct communication with said base station can not be made.

7. A method for conducting a plurality of telephonic communications which comprise transmitted (TX) and received (RX) speech information using wireless transmissions between a primary station and one or more secondary stations over one of a plurality of available frequencies, the method comprising:

(i) transmitting synchronization information from said primary station to said secondary stations on a selected frequency, including the assignment of periodic time slots having the same fixed duration;

(ii) transmitting from said primary station a signal carrying said TX speech information of a first telephonic communication on said selected frequency;

(iii) transmitting from said primary station a signal carrying said TX speech information of a second telephonic communication on said selected frequency;

(iv) receiving by said primary station a signal carrying said RX speech information of said first telephonic communication transmitted from a secondary station on the selected frequency;

(v) receiving by said primary station a signal carrying said RX speech information of said second telephonic communication transmitted from a secondary station on the selected frequency.

8. A method for conducting multiple communications which comprise transmitted (TX) and received (RX) information using wireless transmissions between a primary station and one or more secondary stations over one of a plurality of available frequencies, the method comprising:

(i) transmitting synchronization information from said primary station to said secondary stations including the assignment of fixed periodic time slots, each time slot having the same duration, on a selected frequency, at least two fixed periodic transmit time slots for transmission from said primary station and at least two fixed periodic reception time slots for reception by said primary station;

(ii) transmitting from said primary station a signal carrying said TX information of a first communication on said selected frequency in a first assigned transmit slot;

(iii) transmitting from said primary station a signal carrying said TX information of a second communication on said selected frequency in a second assigned transmit slot;

(iv) receiving by said primary station a signal carrying said RX information of said first communication transmitted from a first secondary station on the selected frequency in a first assigned reception slot;

(v) receiving by said primary station a signal carrying said RX information of said second communication transmitted from a second secondary station on the selected frequency in a second assigned reception slot.